When I had my riding horse Storm I'd take him out through people's field (they were too big to be noticed in really. :P Then I'd turn him in the direction of home and pretend to be running from attackers (he ran all out when running in the direction of home ). I'd also grab a big thick stick and practice be a knight by using it as a sword to hit my intended targets while galloping by. Never too old for this.
I still like to put a big black sweater on, put the hood up, and take my mom's antsy mare out and pretend to be a ring wraith.